Do not set window.opener for links targeting _blank

Setting the policy to Disabled allows popups targeting _blank to access (via JavaScript) the page that requested to open the popup.

Setting the policy to Enabled or leaving it unset causes the window.opener property to be set to null unless the anchor specifies rel="opener".

This policy will be removed in Google Chrome version 95.

See https://chromestatus.com/feature/6140064063029248.

Supported on: At least Microsoft Windows 7 or Windows Server 2008 family

Registry HiveHKEY_CURRENT_USER
Registry PathSoftware\Policies\Google\ChromeOS
Value NameTargetBlankImpliesNoOpener
Value TypeREG_DWORD
Enabled Value1
Disabled Value0

chromeos.admx

Administrative Templates (Computers)

Administrative Templates (Users)